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 FAQ #135
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C4 Brake lights work intermittently
My brake lights seem to work intermittently. I think the problem may be linked to another problem I have regarding cruise control dropping out - lighting up the "service" icon.

I have had a quick look at the pedals assembly but the brake switch(es) don't jump out at me so wonder if they are in the pedal assembly or not.

Any guidance would be appreciated along with where the brake switches are actually located. Thanks for any help

ricnott wrote ...

I have had a similar problem on my 05 plate 1.6hdi (92). For a while when I have switched over to reg cruise the service light would come on and the error message 'cruise control faulty' would be displayed. Last night I noticed that none of my brake lights were working. After a bit of head scratching I decided to look at the brake switch. replaced this and all systems now working for just a £5 part!!

Thanks to the forums for telling me that the switch is located under the glove box on the passenger side of a RHD car. Just pop off the three plastic keepers, remove the lower trim and there is the switch in front of you attached to the cylinder push rod.

A simple 1/4 twist and it is out. reverse to replace.

The reason for the fault seems to be the ratchet mechanism on the 'mushroom' stalk of the switch. This has pushed into the housing of the switch.

Having taken the switch apart I have found that you can effect a temporary repair by holding the body of the switch and pulling the mushroom away. Not sure how long this would last as the plastic teeth may have worn but should get you home.

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FAQ Posted by ricnott
Info Created: 27 March 2009
Last Updated: 27 March 2009